Chain-stitch sewing-machine.



No. 793,127. PATBNTED JUNE 27, 1905. H. G. FISCHER.

CHAIN STITCH SEWING MACHINE.

APPLIOATION FILED JUNE 17, 1904.

VIM/[11,14

UNITED STATES Patented June :27, 1905.

PATENT OEEIcE;

HERMANN CHRISTIAN FISCHER, OF VIENNA, AUSTRIA-HUNGARY, AS-

SIGNOR OF ONE-HALF TO JOHN CHRISTIAN KIRSCH, OF VIENNA,

AUSTRIA-HUNGA RY.

CHAIN-STITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 793,127, dated June 27, 1905.

Application filed June 17,1904. Serial No. 212,969.

To all whom, it may cancer/t:

Be it known that I, HERMANN UIInIs'rIAN FISCHER, a subject of the Emperor of Austria Hungary, and a resident of 8 (trillparzerstrasse 1, Vienna, in the Empire of Austria- Hungary, have invented certain new and useful Improvements in Chain-Stitch Sewing- Machines, of which the following is a specification.

I My invention relates to improvements in chain-stitch sewing-machines.

The principal objects of my invention are to make it possible to arrange a number of ringshaped loopers or hooks together in which in order to insure the loop being properly taken up the point of the looper or hook is formed nearer to its periphery; but in or der to prevent the loop being taken up a second time by the point of the ring-shaped looper or hook the latter is shaped in such a way that its ends overlap each other with an intervening space, so that the loop is only released after the point of the looper or hook has taken up the next loop. I attain these objects, among others, by the mechanisms illustrated in the accompanying drawings, in which- Figure 1 is a sectional elevation of the looper or hook. Fig. 2 is a sectional view showing a number of loopers or hooks arranged close together. Figs. 3 and e are similar views to Fig. 1, showing the looper or hook in different positions during the formation of the stitch.

Similar figuresrefer tosimilar partsthroughout the several views.

The looper or hook 1 is made in the form of a ring having two ends 3 L. which overlap each other for a suitable length, but having a small intervening space 2 between them. The end 3 constitutes the point of the looper or hook, the object of which is, as described below, to seize or take up the loop formed in the thread and to thread it onto the ring, while the outer end i is split and forked, (though the width of the ring is not altered,) so that the needle 5 can pass between the prongs or branches of the fork.

Inside the ring-shaped looper or hook and eccentric thereto thedriving-spindle 6 is journaled, which when only one ring-shaped looper or hook is used is formed with a number of tappets 7-for instance, three, as shown in the drawings--which engage with projections or teeth 8, formed on the inside of the ringsha1.)ed looper or hook in such a way that the tappets only engage the projections or teeth for about the lower two-thirds part of their revolution and in the upper onethird part a space remains between the tappets and the projections, so as to permit the point 3 of the ringshaped looper or hook to take up the loop and release it again easily. If, as shown in Fig. 2, a number of such ringshaped loopers or hooks are arranged close together, then the tappets T are shaped as longitudinal ribs, as shown, which actuate all the ring-shaped loopers or hooks uniformly. In this arrangement the ring-shaped loopers or hooks are preferably loosely fitted in one cylindrical case 9, open at the top, which is attached at 10 to the bed-plate 11 of the machine, and the end 12 of which and springcover 13 are traversed by the driving-spindle 6. Between each of the ring-shaped loopers or hooks and the next or when only one ringshaped looper or hook is used on either side of it are fitted thin circular rings 11, fixed to the case 9, which in addition to keeping the rings separate from each other fulfil a further purpose mentioned below.

The operation-of the ring-shaped looper or hook is as follows: In the position of the parts shown in Fig. l the loop 15, last formed, is taken up by the ringl and is held by theforked end +1 and one end of the thin side rings 1% in such a position that the needle 5 can pass between the branches or prongs of the fork into this loop 15, and thus pass a new thread 17 through the material 16. The rings 1e are arranged in close proximity to the prongs of the forked ends it: and in this manner offer a certain resistance to the passage of the loop 15 over a certain portion of the rings and their prongs. The loop 15, however, is freed from the ends of the rings 14: shortly before the fixed rings 14 are formed with two ends sepaloopers adapted to engage and to release the needle 5 passes into the loop 15. 1f now the ring-shaped looper or hook rotates farther in the direction of the arrow, then the point 3 of the looper 0r hook passes between the needle and the rear thread of the loop 17, formed by the ascent of the needle, and holds this new loop fast in. spite of continued rise of the.- needle.. Only after the new loop 17 has been seized is-the loop .15 released from the fork 4, Fig. 3, by which means it is prevented from being seized a second time by the looper or hook point 3, and when the needle 5, Fig, 4,. has risen the new loop'l7 is drawn at 18 upon the gradually-widening part of the ring 1 onto the fork 4, by which operation it receives its largest width. Loop 17 nowtakes the place of loop 15 upon the forked end 4 of the ring 1, and the method described is repeated. The

rated at the top, and the left end of same extends, Figs. 1, 3, and 4, beyondthe point where the needle passes .inside the loop 15, Fig. 1, so that it holds the latter fast partly directly and partly through the friction between .the inserted ring and the looper or hook. By this means the loop is prevented from being moved too much to the left by the pull of the thread, in which case the needle could not pass through the loop 15.

- Having thus described the nature and objects of my invention, what I claim as new, and desire to secure by Letters'Patent, is

1.- I In amachine of the character described, circular loopers each of said loopers having forked ends adapted to receive a loop and to permit the enteringof a needle into and beyond said loop, a hook-shaped end extending below said forked ends and adapted to engage the thread on said. needle below the loop held by said forked ends and to form in conjunction with said ends, a passage-way adapted to permit-of the castingofl of the loop from said forked ends in a plane above the loop of the thread engaged by said hook-shaped end, and means arranged between said circular loop held by the forked ends prior to the entering of the needle into said loop.

2; In a machine of the character described, 1

circular loopers each of said loopers having5o forked ends, adapted to receive a 'loop and to permit the Venteringjof a needle into and beyond said loop, a hook-shaped end extending belowusaid forked ends and adapted to engage the thread on said needle below the loop held by. said forked ends and to form, in con unction with said ends a passage-wayadapted to permit of the oastingoff-of the loop from said forked ends in a-plane abovethe loop of the thread engaged by said hook-shaped end and fixed ringsarranged between and adjacent to said rotating circular loopers having separate ends forming a space in advance of said. needle, said, rings adapted to engage and disengage the loop on said forked ends prior to the entering of the needle into said loop.

3. In a machine of thecharacter described, circular loopers, each of said loopers having forked ends adapted to receive a loopandto permit the entering'of ane'edle into,and beyond said loop, ahook-shaped end vextending below said forked ends and adapted to engage the thread on saidneedle below the loop held by said forked ends and to form in conjunction with said ends a passage-way adaptedto permit of the casting ofi of,,- the loopgfrom said forked ends in a plane above the loopof the thread engaged by said hook-shapedend,

and means arranged betweensaid circular ment and disengagement of eachvofusaidtappets with a complemental projection on the circular loopers in the rotation of the-same.

In testimony whereof I have hereuntoset my signature in the presence of two ,subscribing witnesses.

;,=. i'HERMANN riGHRISTIAN FISCHER.

" Witnesses:

' ALVESTO SIJHOGUE, 1 AUGUST vEocene. 

